Find Chargebee payments missing from FreshBooks

**Objective:** Find successful Chargebee payments from the last `{lookback-days}` days (default 30) that have no matching payment in FreshBooks company `{company}`.

**Step 1: Read Chargebee**

Call `chargebee-get-transaction` with `date.from` set to the start of the lookback and `status` set to the success status (try `success`). Keep payments (`type` payment), with `id`, `customer-id`, `amount`, `currency-code`, `date`, `reference-number`.

**Step 2: Resolve the customers**

For each distinct `customer-id`, call `chargebee-get-customer` with `id` to get the `email`. Then call `freshbooks-get-client` with that `email` to get the FreshBooks client `id`.

**Step 3: Read FreshBooks payments**

Call `freshbooks-get-payment` with `client-id` set to each client `id` and `date.from` set to the start of the lookback. Match a Chargebee transaction to a FreshBooks payment on the same amount and currency with dates within 3 days, or a `note` containing the Chargebee transaction `id` or `reference-number`.

**Step 4: Report**

List unmatched Chargebee payments with customer email, amount, date and transaction id, then clients not found in FreshBooks, then a total of unmatched money per currency.

**Rules & Guidelines:**

* FreshBooks tools (named freshbooks-...) are on the freshbooks server; Chargebee tools (named chargebee-...) are on the chargebee server. Both servers must be connected.
* Pass `{company}` as the company parameter on every FreshBooks call when it is given; if FreshBooks reports more than one company and none was given, ask which one and stop.
* Match customers on email, case-insensitive and trimmed. Never match on name alone.
* Amounts may be in different currencies; compare only when `currency-code` matches and flag the rest.
* This prompt is read-only. Never call any FreshBooks add, update, delete, mark or send tool, for example `freshbooks-add-payment`, `freshbooks-add-client`, `freshbooks-add-invoice` or `freshbooks-send-invoice-by-email`.

**Validation:**

* Do not count a FreshBooks payment twice when two Chargebee payments have equal amounts; consume each match once.
* If no transactions come back, say so and stop.